Button Cell Batteries V13GA/LR44 10 stk.

Allows students to conduct experiments to measure the speed of light. Reflect a laser off a movable mirror into a light receiver to measure phase differences.

Replacement torsion bands for the Gravitational Torsion Balance (AP-8215A).

Set of four 4 oz bottles of mineral oil, for use with the Millikan Oil Drop Apparatus.

Allows the students observation of velocity of drop rising in an electric field, then permits calculation of the force on the charge carried by the oil drop.